I'm not an outdoor kitchen guy. I can set up my portable kitchen where and how I want it. If I want it.
Duplication is another issue. I have a big 40' RV but I don't need duplication.
2 microwave, 2 sinks, 2 fridges that space can be put to better use.
Sometimes I use the outdoor kitchen exclusively, some times not at all I do not need to dedicate space to an outdoor kitchen 100% of the time. I prefer to use the room for additional living space.
Lastly terrain is an issue some sites are just not set up to allow for the outside kitchen
